トラペジウムクラスター中の星の長期近赤外変光特性

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説明

We examined the properties of 45 variable stars in the Trapezium cluster, which we identified from J, H and Ks band near-infrared imaging with the 1.4 m IRSF telescope carried out at three epochs, 2000, 2005, and 2014. Their positions in the color-magnitude diagram and the two-color diagram show that they are young stellar objects. The variability over 2000 to 2014 of the majority of them (36/45) are found to be classified into two patterns. One group became brighter and bluer while the other became fainter and redder. Stars with larger brightness change showed larger color change with the time scale of ?10 years. The distribution of slope angles in the J vs J-H diagrams of 2014 is similar to that of 2005 showing the bimodal feature consistent with previous work. Comparison of the slope angles with that of interstellar extinction suggests that the origin of variation of about two-thirds of the 45 variables is the change in the column density of material similar to that responsible for the interstellar extinction. The light variation of the remaining variables may be due to the change in accretion and circumstellar disk activity.

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詳細情報 詳細情報について

  • CRID
    1390572174784414080
  • NII論文ID
    120006364315
  • NII書誌ID
    AA12677220
  • DOI
    10.15002/00014240
  • HANDLE
    10114/13596
  • ISSN
    21879923
  • 本文言語コード
    ja
  • 資料種別
    departmental bulletin paper
  • データソース種別
    • JaLC
    • IRDB
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用可

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